Learn Spanish (Latin America): Por favor, vuelve a corregir este texto.

In Spanish, you don't always use a single phrase for "again" like otra vez. A very common and natural way to express doing an action again is to use the verb volver (to return) followed by a and an infinitive verb (the basic "to" form). Here, vuelve a corregir literally means "return to correct", which translates to "correct again".

Is vuelve a command here? Why not use vuelves?

Yes, vuelve is an affirmative command telling someone to do something. Because the speaker is talking to someone informally using tú (you), they use the command form vuelve instead of the normal present tense statement vuelves. If they were speaking formally to an usted, the command would change to vuelva a corregir.

Could I just say corrige este texto otra vez instead?

Yes, you absolutely can! Corrige este texto otra vez and corrige este texto de nuevo are both perfectly valid ways to say this. However, the volver a + infinitive pattern is extremely common in everyday Spanish for repeated actions, so it is an important structure to get comfortable with.

Why is it este texto instead of esto texto?